How long do excess savings from deficit-financed transfers boost demand?
Core argument: The authors' benchmark scenario suggests excess savings from debt-financed fiscal transfers affect aggregate demand for roughly 5 years, versus the conventional partial-equilibrium view that the effect dissipates within a few quarters.
Deficit-financed fiscal transfers generate excess savings. One person’s spending is another person’s income. As we show, taking this fact into account implies that excess savings from debt-financed transfers have much longer-lasting effects than a naive calculation would suggest. In a closed economy, unless the government pays down the debt used to finance the transfers, excess savings do not go away as households spend them down. Instead, the effect of excess savings on aggregate demand slowly dissipates as they “trickle up” the wealth distribution to agents with lower MPCs. Tight monetary policy speeds up this process, but this effect is likely to be quantitatively modest. The partial equilibrium scenario summarizes the conventional wisdom according to which the effect of excess savings will dissipate in a few quarters. By contrast, our benchmark scenario suggests that these effects will stick around for roughly 5 years.











Brandon Adams Comment:
“We think you should know about this paper (“The Trickling Up of Excess Savings” by Adrien Auclert, Matthew Rognlie, and Ludwig Straub) even though we expect that you would disagree with the main findings and we think that you might find the model overly stylized. The model is not especially complex. A debt-financed fiscal transfer starts the action. This transfer is then spent by its recipients in accordance with their marginal propensity to consume. The poor, who have a high marginal propensity to consume, extinguish their excess savings rather quickly. Eventually the money ends in the hands of the lowest marginal propensity to consume individuals, though this process takes some time. The model is a Heterogenous Agent New Keynesian model. Since the model is New Keynesian, it is demand-centric, and is not concerned with some of the things you might be concerned with (savings, investment, incentives). So, as you point out, the “generate income” process is a big magical. The model assumes that after a debt-financed fiscal transfer is spent, the spent money is income for someone else; that income will in turn be spent and will become income for someone else, ad infinitum, until all the money comes to rest with the wealthiest agent, who has a zero marginal propensity to consume The result of this assumption is that any initial transfer, no matter how targeted to the poor, eventually ends up raising wealth inequality. Again, it’s a very stylized model, and all wealth comes to rest with one agent (who has an MPC of zero)….”